Silande MF898 High-Movement Silicone Sealant
High-Performance, Neutral-Cure Silicone
for Architectural Weather Sealing
Features & Benefits:
Neutral-Cure, Medium Modulus: Cures at ambient temperature without releasing corrosive by-products, making it safe for use on sensitive substrates.
Excellent Adhesion: Adheres strongly to a wide range of building materials, including glass and aluminum, without the need for primers.
High Movement Capability: Accommodates joint movement of ±50%, suitable for dynamic joints subject to expansion and contraction.
Weather and Temperature Resistance: Maintains performance in extreme temperatures ranging from -60°C to +180°C (-76°F to +356°F), resisting UV radiation, ozone, and weathering.
Stain Free Application to sensitive substrates such as natural stone, brick, etc.
Product Description:
MF898 is a one-part, RTV (room temperature vulcanizing), neutral-cure silicone sealant engineered for premium weatherproofing performance in architectural applications. It is ideal for sealing joints in curtain walls, façades, skylights, and other building envelope components. With exceptional flexibility, adhesion, and durability, MF898 ensures long-lasting protection against environmental elements.
MF898 is designed for commercial, industrial, and residential construction projects, providing long-term protection in:
Joints in glass and aluminum curtain walls
Weatherproofing for building façades and cladding
Expansion and connection joints requiring high movement accommodation
General glazing and weather sealing in architectural structures
| Property | Value |
|---|---|
| Type | One-Part, Neutral-Cure Silicone |
| Appearance | Non-sag Paste |
| Application Temperature | 10°C to 50°C (50°F to 122°F) |
| Service Temperature | 180°C/ 356°F Maximum |
| Movement Capability | ±50% |
| Hardness (Shore A) | 38 |
| Tack-Free Time | Approximately 2.5 hours |
| Curing Time | 7 to 14 days (depending on conditions) |
| Adhesion | Excellent on glass, aluminum, and other substrates without primer |
| Standards Compliance | ASTM C920 Type S, Grade NS, Class 50, Use M, G, and A. |
- ASTM C920 Class 50, Meets industry standards for exterior weatherproofing and expansion joints.
- ISO 11600, Certified for long-term performance and extreme weather resistance.
- VOC Compliant, Approved for LEED projects and green building applications.
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Surface Preparation: Ensure all surfaces are clean, dry, and free from grease, dust, or other contaminants. Use of an IPA solvent as a cleaning solution is recommended.
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Application: Apply the sealant in temperatures not exceeding 122°F. Use appropriate tools to extrude and tool the sealant smoothly.
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Finishing: For a neat appearance, mask adjacent areas before application and remove masking tape immediately after tooling.
